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Analog Devices Inc./Maxim Integrated MX7828KCWI+
- Part No.:
- MX7828KCWI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- -
- Datasheet:
-
MX7828KCWI+.pdf
- Description:
- IC ADC 8BIT HS 28-SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,658
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Product details
Overview
MX7828KCWI+ from Maxim Integrated is an 8-bit, 8-channel high-speed analog-to-digital converter (ADC) with 2.5 µs conversion time, single +5V supply operation, built-in track/hold, and 0V to +5V analog input range. It serves as a core data acquisition front-end in real-time signal capture systems requiring fast channel multiplexing and direct microprocessor bus interfacing.
For engineers reviewing the MX7828KCWI+ datasheet, MX7828KCWI+ pinout, MX7828KCWI+ application, or MX7828KCWI+ equivalent, key selection considerations include its 8-channel CMOS multiplexer architecture, Mode 0/Mode 1 digital interface flexibility, ±1/2 LSB total unadjusted error, open-drain RDY output for WAIT-state synchronization, and compatibility with AD7828-based designs.
Technical Context
The MX7828KCWI+ employs a half-flash conversion architecture using two 4-bit flash ADC sections and an internal DAC to generate the lower 4 bits from the residue voltage. Its timing-critical internal tracking phase lasts ~1 µs before MS-bit latching, followed by LS-bit conversion completing within 2.5 µs total.
Digital interface supports two modes: Mode 0 uses RDY to extend microprocessor WAIT states and delivers final data after conversion completion; Mode 1 enables pipelined operation where RD initiates new conversion while reading prior result, requiring ≥2.5 µs inter-conversion delay.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 8-bit - delivers 256 discrete digital codes across full-scale input range |
| Conversion Time | 2.5 µs - defines minimum time between successive conversions in Mode 0 |
| Total Unadjusted Error | ±1/2 LSB - includes offset, full-scale, and linearity errors; ensures monotonicity and no missing codes |
| Analog Input Range | 0V to +5V - requires VREF− = GND and VREF+ = +5V for full-scale operation |
| Supply Voltage | +5V only - operates from single rail; no dual or negative supplies required |
| Channel Count | 8-channel multiplexer - selects AIN1–AIN8 via A0/A1/A2 address inputs |
| Track/Hold | Built-in - eliminates external THS component for most input source impedances ≤100Ω |
Pinout & Package
MX7828KCWI+ is housed in a 28-pin Wide SO (Small Outline) package with 300 mil body width and standard 0.050" lead pitch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 8 | AIN1–AIN8 | Analog input channels - multiplexed into single SAR core; AIN1–AIN4 used in MX7824 variants |
| 9 | A0 | LSB channel address input - selects one of eight analog inputs in conjunction with A1/A2 |
| 10 | A1 | Mid-bit channel address input - determines active analog input per Table 1 in datasheet |
| 11 | A2 | MSB channel address input - completes 3-bit address for 8-channel selection |
| 12 | VREF− | Reference lower bound - sets zero-code voltage; must be tied to GND for 0V–5V range |
| 13 | VREF+ | Reference upper bound - sets full-scale voltage; typically +5V for standard operation |
| 14 | GND | Signal ground reference - common return for analog and digital sections |
| 15 | INT | Interrupt output - active-low open-drain signal indicating conversion completion |
| 16 | RDY | Ready output - open-drain status signal for microprocessor WAIT-state control |
| 17 | CS | Chip-select input - enables device and latches address on falling edge |
| 18 | RD | Read input - controls conversion start and data access timing in Mode 0 or Mode 1 |
| 19–26 | DB0–DB7 | Three-state data outputs - deliver latched 8-bit result directly to microprocessor data bus |
| 27 | VDD | Power supply - +5V supply pin; requires 47µF + 0.1µF bypassing to GND |
| 28 | TP (REF OUT) | Test point - not connected internally; no functional use for MX7828KCWI+ |
Key Features
| Feature | Design Value |
|---|---|
| Integrated track/hold | Eliminates need for external THS circuitry when driving from low-impedance sources (≤100Ω) |
| Memory-mapped or I/O-port interface | Requires no external logic to appear as memory location or peripheral port on 80x86/Z80 buses |
| Two-mode digital control | Mode 0 supports WAIT-state microprocessors; Mode 1 enables pipelined read/conversion for faster throughput |
| No external clock required | Internal timing generator eliminates clock distribution complexity and jitter sensitivity |
| Pin compatibility with AD7828 | Enables drop-in replacement in legacy Analog Devices-based designs without PCB revision |
Applications
| Telecommunications Signal Monitoring | Digital Signal Processing Front-End |
|---|---|
Use Scenario: Real-time monitoring of multi-channel voice or data signals in base station receiver chains. IC Role / Device Role / Timing Role: 8-channel ADC sampling up to 400kHz aggregate rate, synchronized via RDY to DSP interrupt controller. Use Value: Enables simultaneous capture of 8 bandpass-filtered speech channels (e.g., Figure 12), supporting real-time spectral analysis without external sample-hold staging. | Use Scenario: High-throughput sensor data ingestion in FPGA-accelerated DSP pipelines. IC Role / Device Role / Timing Role: Data acquisition engine feeding parallel processing blocks; Mode 1 interface allows continuous pipeline fill at 2.5µs intervals. Use Value: Delivers deterministic 2.5µs conversion latency and ±1/2 LSB accuracy, ensuring consistent timing margins for FFT window alignment and filter coefficient updates. |
| High-Speed Servo Control Feedback | Audio Instrumentation Sampling |
Use Scenario: Closed-loop position/velocity feedback in industrial servo drives with >10kHz bandwidth requirements. IC Role / Device Role / Timing Role: Multi-axis analog feedback digitization; INT signal triggers PID computation on microcontroller. Use Value: 2.5µs conversion time supports 100kHz per-channel sampling (MX7828), satisfying Nyquist for 10kHz servo dynamics while maintaining <1 LSB quantization noise floor. | Use Scenario: Multi-track audio level metering and spectral analysis in professional audio analyzers. IC Role / Device Role / Timing Role: Simultaneous sampling of 8 microphone preamp outputs; latched DB0–DB7 outputs feed parallel FIFO buffers. Use Value: Built-in track/hold and 157mV/µs slew rate support 10kHz sinusoidal inputs without external conditioning, preserving harmonic integrity for THD measurement. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 8-bit, 8-channel, high-speed ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7828BNZ | Same pinout, identical 2.5µs conversion, but ±1 LSB total unadjusted error (vs. ±1/2 LSB for MX7828KCWI+) | Acceptable where tighter DC accuracy is not required; same layout and firmware integration | Select AD7828BNZ for cost-sensitive designs where ±1 LSB error meets system calibration budget |
| MAX158CCNG+ | Same manufacturer, includes internal 2.5V reference and REF OUT pin; different 28-pin PDIP package | Preferred when eliminating external reference circuitry reduces BOM count and board space | Choose MAX158CCNG+ when reference stability and reduced external components outweigh SO-package size constraints |
Compared with AD7828BNZ, MX7828KCWI+ offers superior DC accuracy (±1/2 LSB vs. ±1 LSB) at identical speed and footprint; versus MAX158CCNG+, it trades internal reference convenience for smaller SO package and higher temperature grade (0°C to +70°C vs. −40°C to +85°C).
Availability
MX7828KCWI+ is available at Aetrix Electronics and suitable for telecommunications signal monitoring, high-speed servo control feedback, and audio instrumentation sampling requiring stable component supply across industrial production cycles.
Supply support for MX7828KCWI+ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, communications, and computing applications.
The MX7828KCWI+ belongs to Maxim's legacy high-speed data acquisition product line, designed specifically for cost-effective, pin-compatible migration from AD7828-based systems while delivering improved DC accuracy and simplified power architecture.
FAQ
What is the maximum sampling rate achievable with the MX7828KCWI+?
The MX7828KCWI+ achieves a maximum aggregate sampling rate of 400kHz, calculated as 1/(tCRD + tp) = 1/(2.5µs + 0.5µs). This allows 50kHz per channel across all eight inputs. The rate is constrained by the fixed 2.5µs conversion time and mandatory 500ns inter-conversion delay, not by external clocking.
Does the MX7828KCWI+ require an external reference voltage?
Yes, the MX7828KCWI+ requires external VREF+ and VREF− connections to define its full-scale and zero-scale points. Unlike the MAX158, it lacks an internal reference; typical configuration uses VREF− = GND and VREF+ = +5V for a 0V to +5V input range. The TP (REF OUT) pin is unconnected.
How does the MX7828KCWI+ interface with an 80C51 microcontroller?
The MX7828KCWI+ interfaces directly with the 80C51 using Mode 0: CS and RD are tied to P3.7 (WR) and P3.6 (RD), respectively; RDY connects to the 80C51's READY pin to insert wait states. INT can trigger INT0/INT1. DB0–DB7 connect to P0, with ALE and PSEN managing bus contention. No glue logic is needed.
What is the purpose of the TP (REF OUT) pin on the MX7828KCWI+?
The TP (REF OUT) pin on the MX7828KCWI+ is a test point with no internal connection. It is reserved for factory testing and must remain unconnected in end-user circuits. This differs from the MAX158, where REF OUT delivers a regulated 2.5V reference.
Can the MX7828KCWI+ operate with analog input signals exceeding 5V?
No, the MX7828KCWI+ analog inputs are strictly limited to 0V to +5V when VREF− = GND and VREF+ = +5V. Exceeding this range violates absolute maximum ratings and risks damage or erroneous conversion. For bipolar or extended-range inputs, external signal conditioning (e.g., scaling amplifier per Figure 10a) is required before the AIN pins.
MX7828KCWI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- *
- Package/Case:
- -
- Packaging:
- Bulk
- Product Status:
- Obsolete
- Number of Bits:
- -
- Sampling Rate (Per Second):
- -
- Number of Inputs:
- -
- Input Type:
- -
- Data Interface:
- -
- Configuration:
- -
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- -
- Architecture:
- -
- Reference Type:
- -
- Voltage - Supply, Analog:
- -
- Voltage - Supply, Digital:
- -
- Features:
- -
- Operating Temperature:
- -
- Supplier Device Package:
- -
- Mounting Type:
- -
- Grade:
- -
- Qualification:
- -
MX7828KCWI+ FAQ
1.How can I place an order for MX7828KCWI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MX7828KCWI+ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for MX7828KCWI+ reliable?
The price and inventory of MX7828KCWI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MX7828KCWI+ is usually 5 days.
3.What payment methods are accepted for MX7828KCWI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MX7828KCWI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MX7828KCWI+?
MX7828KCWI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MX7828KCWI+ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for MX7828KCWI+?
For technical support, including MX7828KCWI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MX7828KCWI+ requirements.
6.How does Aetrix verify that MX7828KCWI+ is sourced from the original manufacturer or authorized distributors?
All MX7828KCWI+ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that MX7828KCWI+ meets industry standards.
7.What is the process for return or replacement of MX7828KCWI+?
All MX7828KCWI+ units undergo pre-shipment inspection (PSI). If there is an issue with MX7828KCWI+, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The MX7828KCWI+ part is unused and in its original packaging.
Return procedure for MX7828KCWI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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